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How US Cities Compare to Most Polluted in World Amid Canadian Wildfires

How US Cities Compare to Most Polluted in World Amid Canadian Wildfires

Summary

Three U.S. cities—Detroit, Chicago, and Washington, D.C.—had some of the worst air quality in the world due to smoke from Canadian wildfires. The smoke spread across the Midwest and Northeast, causing unhealthy air levels and health warnings. Other heavily polluted cities included Kinshasa, Delhi, and Jakarta.

Key Facts

  • Detroit had the worst air quality among major cities with an Air Quality Index (AQI) of 240, labeled "very unhealthy."
  • Chicago and Washington, D.C., also had high AQI readings of 199 and 172, respectively.
  • Smoke from wildfires in northern Ontario spread south, affecting many U.S. states around the Great Lakes and Northeast.
  • The pollution measured, PM2.5, consists of tiny particles that can harm lungs and enter the bloodstream.
  • The poor air quality was caused mainly by the wildfire smoke, not by the cities’ usual pollution levels.
  • Health officials advised people in affected areas to stay indoors or wear quality masks outdoors.
  • Dense smoke reduced visibility near Detroit and some nearby lakes, leading to warnings and alerts.
  • New York City canceled outdoor activities and opened cooling centers due to unhealthy air combined with high temperatures.
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